His clients included Christine Keeler, a model convicted of perjury for her role in the 1960s "Profumo affair", and Soviet spies George Blake and John Vassall. He was junior counsel (with lead defense attorney Gerald Gardiner) for his best-known case, defending Penguin Books against obscenity charges for publishing an uncensored version of D.H. Lawrence's novel "Lady Chatterley's Lover"; the defense prevailed.
